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95857638 | 1 | // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
1da177e4 LT |
2 | /****************************************************************************** |
3 | * | |
4 | * Module Name: exmutex - ASL Mutex Acquire/Release functions | |
5 | * | |
800ba7c5 | 6 | * Copyright (C) 2000 - 2020, Intel Corp. |
1da177e4 | 7 | * |
95857638 | 8 | *****************************************************************************/ |
1da177e4 | 9 | |
1da177e4 | 10 | #include <acpi/acpi.h> |
e2f7a777 LB |
11 | #include "accommon.h" |
12 | #include "acinterp.h" | |
13 | #include "acevents.h" | |
1da177e4 LT |
14 | |
15 | #define _COMPONENT ACPI_EXECUTER | |
4be44fcd | 16 | ACPI_MODULE_NAME("exmutex") |
1da177e4 | 17 | |
44f6c012 | 18 | /* Local prototypes */ |
44f6c012 | 19 | static void |
4be44fcd LB |
20 | acpi_ex_link_mutex(union acpi_operand_object *obj_desc, |
21 | struct acpi_thread_state *thread); | |
1da177e4 LT |
22 | |
23 | /******************************************************************************* | |
24 | * | |
25 | * FUNCTION: acpi_ex_unlink_mutex | |
26 | * | |
27 | * PARAMETERS: obj_desc - The mutex to be unlinked | |
28 | * | |
44f6c012 | 29 | * RETURN: None |
1da177e4 | 30 | * |
b229cf92 | 31 | * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list |
1da177e4 LT |
32 | * |
33 | ******************************************************************************/ | |
34 | ||
262a7a28 | 35 | void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc) |
1da177e4 | 36 | { |
262a7a28 LB |
37 | struct acpi_thread_state *thread = obj_desc->mutex.owner_thread; |
38 | ||
1da177e4 LT |
39 | if (!thread) { |
40 | return; | |
41 | } | |
42 | ||
43 | /* Doubly linked list */ | |
44 | ||
45 | if (obj_desc->mutex.next) { | |
46 | (obj_desc->mutex.next)->mutex.prev = obj_desc->mutex.prev; | |
47 | } | |
48 | ||
49 | if (obj_desc->mutex.prev) { | |
50 | (obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next; | |
10a3b461 BM |
51 | |
52 | /* | |
a7499bc8 BM |
53 | * Migrate the previous sync level associated with this mutex to |
54 | * the previous mutex on the list so that it may be preserved. | |
55 | * This handles the case where several mutexes have been acquired | |
56 | * at the same level, but are not released in opposite order. | |
10a3b461 BM |
57 | */ |
58 | (obj_desc->mutex.prev)->mutex.original_sync_level = | |
59 | obj_desc->mutex.original_sync_level; | |
4be44fcd | 60 | } else { |
1da177e4 LT |
61 | thread->acquired_mutex_list = obj_desc->mutex.next; |
62 | } | |
63 | } | |
64 | ||
1da177e4 LT |
65 | /******************************************************************************* |
66 | * | |
67 | * FUNCTION: acpi_ex_link_mutex | |
68 | * | |
a7499bc8 | 69 | * PARAMETERS: obj_desc - The mutex to be linked |
ba494bee | 70 | * thread - Current executing thread object |
1da177e4 | 71 | * |
44f6c012 | 72 | * RETURN: None |
1da177e4 | 73 | * |
b229cf92 | 74 | * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk |
1da177e4 LT |
75 | * |
76 | ******************************************************************************/ | |
77 | ||
44f6c012 | 78 | static void |
4be44fcd LB |
79 | acpi_ex_link_mutex(union acpi_operand_object *obj_desc, |
80 | struct acpi_thread_state *thread) | |
1da177e4 | 81 | { |
4be44fcd | 82 | union acpi_operand_object *list_head; |
1da177e4 LT |
83 | |
84 | list_head = thread->acquired_mutex_list; | |
85 | ||
86 | /* This object will be the first object in the list */ | |
87 | ||
88 | obj_desc->mutex.prev = NULL; | |
89 | obj_desc->mutex.next = list_head; | |
90 | ||
91 | /* Update old first object to point back to this object */ | |
92 | ||
93 | if (list_head) { | |
94 | list_head->mutex.prev = obj_desc; | |
95 | } | |
96 | ||
97 | /* Update list head */ | |
98 | ||
99 | thread->acquired_mutex_list = obj_desc; | |
100 | } | |
101 | ||
ba886cd4 BM |
102 | /******************************************************************************* |
103 | * | |
104 | * FUNCTION: acpi_ex_acquire_mutex_object | |
105 | * | |
ba494bee | 106 | * PARAMETERS: timeout - Timeout in milliseconds |
ba886cd4 | 107 | * obj_desc - Mutex object |
a7499bc8 | 108 | * thread_id - Current thread state |
ba886cd4 BM |
109 | * |
110 | * RETURN: Status | |
111 | * | |
91e38d10 BM |
112 | * DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common |
113 | * path that supports multiple acquires by the same thread. | |
114 | * | |
115 | * MUTEX: Interpreter must be locked | |
116 | * | |
117 | * NOTE: This interface is called from three places: | |
118 | * 1) From acpi_ex_acquire_mutex, via an AML Acquire() operator | |
119 | * 2) From acpi_ex_acquire_global_lock when an AML Field access requires the | |
120 | * global lock | |
121 | * 3) From the external interface, acpi_acquire_global_lock | |
ba886cd4 BM |
122 | * |
123 | ******************************************************************************/ | |
124 | ||
125 | acpi_status | |
126 | acpi_ex_acquire_mutex_object(u16 timeout, | |
127 | union acpi_operand_object *obj_desc, | |
128 | acpi_thread_id thread_id) | |
129 | { | |
130 | acpi_status status; | |
131 | ||
132 | ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex_object, obj_desc); | |
133 | ||
f02e9fa1 BM |
134 | if (!obj_desc) { |
135 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
136 | } | |
137 | ||
ba886cd4 BM |
138 | /* Support for multiple acquires by the owning thread */ |
139 | ||
140 | if (obj_desc->mutex.thread_id == thread_id) { | |
141 | /* | |
142 | * The mutex is already owned by this thread, just increment the | |
143 | * acquisition depth | |
144 | */ | |
145 | obj_desc->mutex.acquisition_depth++; | |
146 | return_ACPI_STATUS(AE_OK); | |
147 | } | |
148 | ||
149 | /* Acquire the mutex, wait if necessary. Special case for Global Lock */ | |
150 | ||
151 | if (obj_desc == acpi_gbl_global_lock_mutex) { | |
152 | status = acpi_ev_acquire_global_lock(timeout); | |
153 | } else { | |
cd162b35 BM |
154 | status = |
155 | acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex, | |
156 | timeout); | |
ba886cd4 BM |
157 | } |
158 | ||
159 | if (ACPI_FAILURE(status)) { | |
160 | ||
161 | /* Includes failure from a timeout on time_desc */ | |
162 | ||
163 | return_ACPI_STATUS(status); | |
164 | } | |
165 | ||
91e38d10 | 166 | /* Acquired the mutex: update mutex object */ |
ba886cd4 BM |
167 | |
168 | obj_desc->mutex.thread_id = thread_id; | |
169 | obj_desc->mutex.acquisition_depth = 1; | |
170 | obj_desc->mutex.original_sync_level = 0; | |
171 | obj_desc->mutex.owner_thread = NULL; /* Used only for AML Acquire() */ | |
172 | ||
173 | return_ACPI_STATUS(AE_OK); | |
174 | } | |
175 | ||
1da177e4 LT |
176 | /******************************************************************************* |
177 | * | |
178 | * FUNCTION: acpi_ex_acquire_mutex | |
179 | * | |
44f6c012 RM |
180 | * PARAMETERS: time_desc - Timeout integer |
181 | * obj_desc - Mutex object | |
182 | * walk_state - Current method execution state | |
1da177e4 LT |
183 | * |
184 | * RETURN: Status | |
185 | * | |
186 | * DESCRIPTION: Acquire an AML mutex | |
187 | * | |
188 | ******************************************************************************/ | |
189 | ||
190 | acpi_status | |
4be44fcd LB |
191 | acpi_ex_acquire_mutex(union acpi_operand_object *time_desc, |
192 | union acpi_operand_object *obj_desc, | |
193 | struct acpi_walk_state *walk_state) | |
1da177e4 | 194 | { |
4be44fcd | 195 | acpi_status status; |
1da177e4 | 196 | |
b229cf92 | 197 | ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex, obj_desc); |
1da177e4 LT |
198 | |
199 | if (!obj_desc) { | |
4be44fcd | 200 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
201 | } |
202 | ||
a7499bc8 | 203 | /* Must have a valid thread state struct */ |
1da177e4 LT |
204 | |
205 | if (!walk_state->thread) { | |
b8e4d893 BM |
206 | ACPI_ERROR((AE_INFO, |
207 | "Cannot acquire Mutex [%4.4s], null thread info", | |
208 | acpi_ut_get_node_name(obj_desc->mutex.node))); | |
4be44fcd | 209 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
210 | } |
211 | ||
212 | /* | |
cd162b35 BM |
213 | * Current sync level must be less than or equal to the sync level |
214 | * of the mutex. This mechanism provides some deadlock prevention. | |
1da177e4 LT |
215 | */ |
216 | if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) { | |
b8e4d893 | 217 | ACPI_ERROR((AE_INFO, |
cd162b35 BM |
218 | "Cannot acquire Mutex [%4.4s], " |
219 | "current SyncLevel is too large (%u)", | |
967440e3 BM |
220 | acpi_ut_get_node_name(obj_desc->mutex.node), |
221 | walk_state->thread->current_sync_level)); | |
4be44fcd | 222 | return_ACPI_STATUS(AE_AML_MUTEX_ORDER); |
1da177e4 LT |
223 | } |
224 | ||
cd162b35 BM |
225 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
226 | "Acquiring: Mutex SyncLevel %u, Thread SyncLevel %u, " | |
227 | "Depth %u TID %p\n", | |
228 | obj_desc->mutex.sync_level, | |
229 | walk_state->thread->current_sync_level, | |
230 | obj_desc->mutex.acquisition_depth, | |
231 | walk_state->thread)); | |
232 | ||
5431b654 | 233 | status = acpi_ex_acquire_mutex_object((u16)time_desc->integer.value, |
ba886cd4 BM |
234 | obj_desc, |
235 | walk_state->thread->thread_id); | |
cd162b35 | 236 | |
ba886cd4 | 237 | if (ACPI_SUCCESS(status) && obj_desc->mutex.acquisition_depth == 1) { |
91e38d10 BM |
238 | |
239 | /* Save Thread object, original/current sync levels */ | |
240 | ||
ba886cd4 BM |
241 | obj_desc->mutex.owner_thread = walk_state->thread; |
242 | obj_desc->mutex.original_sync_level = | |
243 | walk_state->thread->current_sync_level; | |
244 | walk_state->thread->current_sync_level = | |
245 | obj_desc->mutex.sync_level; | |
1da177e4 | 246 | |
ba886cd4 BM |
247 | /* Link the mutex to the current thread for force-unlock at method exit */ |
248 | ||
249 | acpi_ex_link_mutex(obj_desc, walk_state->thread); | |
1da177e4 LT |
250 | } |
251 | ||
cd162b35 BM |
252 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
253 | "Acquired: Mutex SyncLevel %u, Thread SyncLevel %u, Depth %u\n", | |
254 | obj_desc->mutex.sync_level, | |
255 | walk_state->thread->current_sync_level, | |
256 | obj_desc->mutex.acquisition_depth)); | |
257 | ||
ba886cd4 BM |
258 | return_ACPI_STATUS(status); |
259 | } | |
c81da666 | 260 | |
ba886cd4 BM |
261 | /******************************************************************************* |
262 | * | |
263 | * FUNCTION: acpi_ex_release_mutex_object | |
264 | * | |
265 | * PARAMETERS: obj_desc - The object descriptor for this op | |
266 | * | |
267 | * RETURN: Status | |
268 | * | |
269 | * DESCRIPTION: Release a previously acquired Mutex, low level interface. | |
91e38d10 BM |
270 | * Provides a common path that supports multiple releases (after |
271 | * previous multiple acquires) by the same thread. | |
272 | * | |
273 | * MUTEX: Interpreter must be locked | |
274 | * | |
275 | * NOTE: This interface is called from three places: | |
276 | * 1) From acpi_ex_release_mutex, via an AML Acquire() operator | |
277 | * 2) From acpi_ex_release_global_lock when an AML Field access requires the | |
278 | * global lock | |
279 | * 3) From the external interface, acpi_release_global_lock | |
ba886cd4 BM |
280 | * |
281 | ******************************************************************************/ | |
1da177e4 | 282 | |
ba886cd4 BM |
283 | acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc) |
284 | { | |
285 | acpi_status status = AE_OK; | |
52fc0b02 | 286 | |
ba886cd4 | 287 | ACPI_FUNCTION_TRACE(ex_release_mutex_object); |
1da177e4 | 288 | |
f02e9fa1 | 289 | if (obj_desc->mutex.acquisition_depth == 0) { |
68aafc35 | 290 | return_ACPI_STATUS(AE_NOT_ACQUIRED); |
f02e9fa1 BM |
291 | } |
292 | ||
ba886cd4 BM |
293 | /* Match multiple Acquires with multiple Releases */ |
294 | ||
295 | obj_desc->mutex.acquisition_depth--; | |
296 | if (obj_desc->mutex.acquisition_depth != 0) { | |
297 | ||
298 | /* Just decrement the depth and return */ | |
299 | ||
300 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
301 | } |
302 | ||
ba886cd4 | 303 | if (obj_desc->mutex.owner_thread) { |
1da177e4 | 304 | |
ba886cd4 BM |
305 | /* Unlink the mutex from the owner's list */ |
306 | ||
307 | acpi_ex_unlink_mutex(obj_desc); | |
308 | obj_desc->mutex.owner_thread = NULL; | |
309 | } | |
1da177e4 | 310 | |
ba886cd4 | 311 | /* Release the mutex, special case for Global Lock */ |
1da177e4 | 312 | |
ba886cd4 BM |
313 | if (obj_desc == acpi_gbl_global_lock_mutex) { |
314 | status = acpi_ev_release_global_lock(); | |
315 | } else { | |
316 | acpi_os_release_mutex(obj_desc->mutex.os_mutex); | |
317 | } | |
1da177e4 | 318 | |
91e38d10 BM |
319 | /* Clear mutex info */ |
320 | ||
28eb3fcf | 321 | obj_desc->mutex.thread_id = 0; |
ba886cd4 | 322 | return_ACPI_STATUS(status); |
1da177e4 LT |
323 | } |
324 | ||
1da177e4 LT |
325 | /******************************************************************************* |
326 | * | |
327 | * FUNCTION: acpi_ex_release_mutex | |
328 | * | |
329 | * PARAMETERS: obj_desc - The object descriptor for this op | |
44f6c012 | 330 | * walk_state - Current method execution state |
1da177e4 LT |
331 | * |
332 | * RETURN: Status | |
333 | * | |
334 | * DESCRIPTION: Release a previously acquired Mutex. | |
335 | * | |
336 | ******************************************************************************/ | |
337 | ||
338 | acpi_status | |
4be44fcd LB |
339 | acpi_ex_release_mutex(union acpi_operand_object *obj_desc, |
340 | struct acpi_walk_state *walk_state) | |
1da177e4 | 341 | { |
10a3b461 | 342 | u8 previous_sync_level; |
e0f40281 | 343 | struct acpi_thread_state *owner_thread; |
cd162b35 | 344 | acpi_status status = AE_OK; |
1da177e4 | 345 | |
b229cf92 | 346 | ACPI_FUNCTION_TRACE(ex_release_mutex); |
1da177e4 LT |
347 | |
348 | if (!obj_desc) { | |
4be44fcd | 349 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
350 | } |
351 | ||
e0f40281 LM |
352 | owner_thread = obj_desc->mutex.owner_thread; |
353 | ||
1da177e4 LT |
354 | /* The mutex must have been previously acquired in order to release it */ |
355 | ||
e0f40281 | 356 | if (!owner_thread) { |
b8e4d893 BM |
357 | ACPI_ERROR((AE_INFO, |
358 | "Cannot release Mutex [%4.4s], not acquired", | |
359 | acpi_ut_get_node_name(obj_desc->mutex.node))); | |
4be44fcd | 360 | return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED); |
1da177e4 LT |
361 | } |
362 | ||
75c8044f | 363 | /* Must have a valid thread ID */ |
3e8214e5 | 364 | |
fbc3be2a DC |
365 | if (!walk_state->thread) { |
366 | ACPI_ERROR((AE_INFO, | |
367 | "Cannot release Mutex [%4.4s], null thread info", | |
368 | acpi_ut_get_node_name(obj_desc->mutex.node))); | |
369 | return_ACPI_STATUS(AE_AML_INTERNAL); | |
370 | } | |
371 | ||
1da177e4 LT |
372 | /* |
373 | * The Mutex is owned, but this thread must be the owner. | |
374 | * Special case for Global Lock, any thread can release | |
375 | */ | |
e0f40281 LM |
376 | if ((owner_thread->thread_id != walk_state->thread->thread_id) && |
377 | (obj_desc != acpi_gbl_global_lock_mutex)) { | |
b8e4d893 | 378 | ACPI_ERROR((AE_INFO, |
28eb3fcf LM |
379 | "Thread %u cannot release Mutex [%4.4s] acquired by thread %u", |
380 | (u32)walk_state->thread->thread_id, | |
b8e4d893 | 381 | acpi_ut_get_node_name(obj_desc->mutex.node), |
28eb3fcf | 382 | (u32)owner_thread->thread_id)); |
4be44fcd | 383 | return_ACPI_STATUS(AE_AML_NOT_OWNER); |
1da177e4 LT |
384 | } |
385 | ||
386 | /* | |
315c7288 BM |
387 | * The sync level of the mutex must be equal to the current sync level. In |
388 | * other words, the current level means that at least one mutex at that | |
389 | * level is currently being held. Attempting to release a mutex of a | |
390 | * different level can only mean that the mutex ordering rule is being | |
391 | * violated. This behavior is clarified in ACPI 4.0 specification. | |
1da177e4 | 392 | */ |
e0f40281 | 393 | if (obj_desc->mutex.sync_level != owner_thread->current_sync_level) { |
b8e4d893 | 394 | ACPI_ERROR((AE_INFO, |
cd162b35 BM |
395 | "Cannot release Mutex [%4.4s], SyncLevel mismatch: " |
396 | "mutex %u current %u", | |
f02e9fa1 BM |
397 | acpi_ut_get_node_name(obj_desc->mutex.node), |
398 | obj_desc->mutex.sync_level, | |
399 | walk_state->thread->current_sync_level)); | |
4be44fcd | 400 | return_ACPI_STATUS(AE_AML_MUTEX_ORDER); |
1da177e4 LT |
401 | } |
402 | ||
10a3b461 BM |
403 | /* |
404 | * Get the previous sync_level from the head of the acquired mutex list. | |
405 | * This handles the case where several mutexes at the same level have been | |
406 | * acquired, but are not released in reverse order. | |
407 | */ | |
408 | previous_sync_level = | |
e0f40281 | 409 | owner_thread->acquired_mutex_list->mutex.original_sync_level; |
10a3b461 | 410 | |
cd162b35 BM |
411 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
412 | "Releasing: Object SyncLevel %u, Thread SyncLevel %u, " | |
413 | "Prev SyncLevel %u, Depth %u TID %p\n", | |
414 | obj_desc->mutex.sync_level, | |
415 | walk_state->thread->current_sync_level, | |
416 | previous_sync_level, | |
417 | obj_desc->mutex.acquisition_depth, | |
418 | walk_state->thread)); | |
419 | ||
ba886cd4 | 420 | status = acpi_ex_release_mutex_object(obj_desc); |
315c7288 BM |
421 | if (ACPI_FAILURE(status)) { |
422 | return_ACPI_STATUS(status); | |
423 | } | |
1da177e4 | 424 | |
f02e9fa1 | 425 | if (obj_desc->mutex.acquisition_depth == 0) { |
1da177e4 | 426 | |
315c7288 | 427 | /* Restore the previous sync_level */ |
f02e9fa1 | 428 | |
e0f40281 | 429 | owner_thread->current_sync_level = previous_sync_level; |
f02e9fa1 | 430 | } |
a7499bc8 | 431 | |
cd162b35 BM |
432 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
433 | "Released: Object SyncLevel %u, Thread SyncLevel, %u, " | |
434 | "Prev SyncLevel %u, Depth %u\n", | |
435 | obj_desc->mutex.sync_level, | |
436 | walk_state->thread->current_sync_level, | |
437 | previous_sync_level, | |
438 | obj_desc->mutex.acquisition_depth)); | |
439 | ||
4be44fcd | 440 | return_ACPI_STATUS(status); |
1da177e4 LT |
441 | } |
442 | ||
1da177e4 LT |
443 | /******************************************************************************* |
444 | * | |
445 | * FUNCTION: acpi_ex_release_all_mutexes | |
446 | * | |
ba494bee | 447 | * PARAMETERS: thread - Current executing thread object |
1da177e4 LT |
448 | * |
449 | * RETURN: Status | |
450 | * | |
44f6c012 | 451 | * DESCRIPTION: Release all mutexes held by this thread |
1da177e4 | 452 | * |
f70a5e7b BM |
453 | * NOTE: This function is called as the thread is exiting the interpreter. |
454 | * Mutexes are not released when an individual control method is exited, but | |
455 | * only when the parent thread actually exits the interpreter. This allows one | |
456 | * method to acquire a mutex, and a different method to release it, as long as | |
457 | * this is performed underneath a single parent control method. | |
458 | * | |
1da177e4 LT |
459 | ******************************************************************************/ |
460 | ||
4be44fcd | 461 | void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread) |
1da177e4 | 462 | { |
4be44fcd | 463 | union acpi_operand_object *next = thread->acquired_mutex_list; |
c81da666 | 464 | union acpi_operand_object *obj_desc; |
1da177e4 | 465 | |
cd162b35 | 466 | ACPI_FUNCTION_TRACE(ex_release_all_mutexes); |
1da177e4 LT |
467 | |
468 | /* Traverse the list of owned mutexes, releasing each one */ | |
469 | ||
470 | while (next) { | |
c81da666 | 471 | obj_desc = next; |
2489ef01 | 472 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
cd162b35 BM |
473 | "Mutex [%4.4s] force-release, SyncLevel %u Depth %u\n", |
474 | obj_desc->mutex.node->name.ascii, | |
475 | obj_desc->mutex.sync_level, | |
476 | obj_desc->mutex.acquisition_depth)); | |
2489ef01 | 477 | |
c81da666 | 478 | /* Release the mutex, special case for Global Lock */ |
1da177e4 | 479 | |
ba886cd4 | 480 | if (obj_desc == acpi_gbl_global_lock_mutex) { |
1da177e4 | 481 | |
c81da666 | 482 | /* Ignore errors */ |
1da177e4 | 483 | |
c81da666 BM |
484 | (void)acpi_ev_release_global_lock(); |
485 | } else { | |
486 | acpi_os_release_mutex(obj_desc->mutex.os_mutex); | |
1da177e4 LT |
487 | } |
488 | ||
1da177e4 LT |
489 | /* Update Thread sync_level (Last mutex is the important one) */ |
490 | ||
c81da666 BM |
491 | thread->current_sync_level = |
492 | obj_desc->mutex.original_sync_level; | |
cd162b35 BM |
493 | |
494 | /* Mark mutex unowned */ | |
495 | ||
496 | next = obj_desc->mutex.next; | |
497 | ||
498 | obj_desc->mutex.prev = NULL; | |
499 | obj_desc->mutex.next = NULL; | |
500 | obj_desc->mutex.acquisition_depth = 0; | |
501 | obj_desc->mutex.owner_thread = NULL; | |
502 | obj_desc->mutex.thread_id = 0; | |
1da177e4 | 503 | } |
cd162b35 BM |
504 | |
505 | return_VOID; | |
1da177e4 | 506 | } |